brain-dead adjective

1. suffering from serious damage to the brain and needing machines to stay alive
   • ● Doctors declared her clinically brain-dead.
2. (humorous) very stupid and boring; not intelligent
   • ● I was afraid of becoming brain-dead after months at home.
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[TahlilGaran] English Dictionary ▲

be brain dead
if someone is brain dead, their mind is not working effectively, usually because they are very tired or very bored

[TahlilGaran] English Idioms Dictionary ▲